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Writing a sequence in terms of n.

  1. Dec 10, 2011 #1
    1. The problem statement, all variables and given/known data

    given: Vn+1=Vn*cos(pi/2^(n+2))

    2. Relevant equations

    Write a sequence Vn in terms of n

    3. The attempt at a solution

    we substitute n with n-1 and we get:

    V(n-1)+1= Vn-1*cos(pi/2^(n-1+2))

    Vn=Vn-1*cos(pi/2^(n+1)

    Is this correct?
     
    Last edited: Dec 10, 2011
  2. jcsd
  3. Dec 10, 2011 #2

    SammyS

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    Yes: Vn = Vn-1*cos(π/2(n+1)) .
     
  4. Dec 10, 2011 #3
    Alright it was an extra credit question in class just wanted to make sure if it was correct. Thank you very much.
     
  5. Dec 10, 2011 #4
    Off topic question, do u know any good latex software i can't used the stuff given in the forums.
     
  6. Dec 10, 2011 #5

    SammyS

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    I mostly use the LaTeX from the Forums.

    To check my code I sometimes use mimeTeX online.

    Do a search in these Forums.
     
  7. Dec 10, 2011 #6
    Alright really appreciate it.
     
  8. Dec 10, 2011 #7

    LCKurtz

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    Google Lyx and/or Miktex.
     
  9. Dec 10, 2011 #8
    Yea i have them, but when i type up something in there and I try putting it up in here it comes up all weird.
     
  10. Dec 10, 2011 #9

    LCKurtz

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    Oh, I didn't understand that's what you wanted to do. What problem are you having using the forum TeX tools for the forum?
     
  11. Dec 10, 2011 #10
    It's not a 'problem' but sometimes when I want to type something in it doesn't come up how I want it. This is an example with Lyx:

    U_{n+1}=V_{n}+U_{n}
     
  12. Dec 10, 2011 #11

    LCKurtz

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    I'm confused. That is an example of what with Lyx?[tex]U_{n+1}=V_{n}+U_{n}[/tex] displays OK here with tex tags.
     
  13. Dec 10, 2011 #12
    Yea i can't get it to come out like that how can i do it?
     
  14. Dec 10, 2011 #13

    LCKurtz

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    You have to enclose tex expressions with tex or itex tags. They are like the $$ or $ tags in regular tex. Right click on the expression to see the source.

    [Edit] Woops, that doesn't show the tags. Start to reply with a quote to the post with the tex and you will see the tex tags. It's like this: [tox]Put your tex here[/tox] and use tex instead of tox. (If I use tex you won't see the tags).
     
    Last edited: Dec 10, 2011
  15. Dec 10, 2011 #14
    [tex]U_{n+1}=V_{n}+U_{n}[/tex]



    alright i got it to work thanx a million!
     
  16. Dec 10, 2011 #15

    LCKurtz

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    Yep. You can use itex for inline and you can preview your posts before you submit them to see it's all OK.
     
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